Rescue workers look for survivors following the collision of two Penn Central commuter trains near Hoyt Street in Darien on Aug. 20, 1969. Four people were killed and more than 40 were injured in the accident which prompted calls for increased safety.
Photo: File Photo/Tom Ryan

Rescue workers look for survivors following the collision of two...

FILE — Rescue workers look for survivors following the collision of two Penn Central commuter trains near Hoyt Street in Darien on Aug. 20, 1969. Four people were killed and more than 40 were injured in the accident which prompted calls for increased safety.
Photo: File Photo/Tom Ryan

FILE — Rescue workers look for survivors following the collision...

A Metro-North train travels south between the Talmadge Hill station and the Hoyt Street crossing in Darien, Conn., on Wednesday, July 9, 2014.